<?php

class ArticleController extends Controller {

    /**
     * @var string the default layout for the views. Defaults to '//layouts/column2', meaning
     * using two-column layout. See 'protected/views/layouts/column2.php'.
     */
    public $layout = '//layouts/main';
    private $_model;

    /**
     * @return array action filters
     */
    public function filters() {
        return array(
            'accessControl', // perform access control for CRUD operations
        );
    }

    /**
     * Displays a particular model.
     * @param integer $id the ID of the model to be displayed
     */
    public function actionView() {
        $article = $this->loadModel();
        $comment = $this->newComment($article);
        $this->render('view', array(
            'model' => $article,
            'comment' => $comment,
        ));
    }

    /**
     * Creates a new model.
     * If creation is successful, the browser will be redirected to the 'view' page.
     */
    public function actionCreate() {
        $model = new Article;

        // Uncomment the following line if AJAX validation is needed
        // $this->performAjaxValidation($model);

        if (isset($_POST['Article'])) {
            $model->attributes = $_POST['Article'];
            if ($model->save())
                $this->redirect(array('view', 'id' => $model->id));
        }

        $this->render('create', array(
            'model' => $model,
        ));
    }

    /**
     * Updates a particular model.
     * If update is successful, the browser will be redirected to the 'view' page.
     * @param integer $id the ID of the model to be updated
     */
    public function actionUpdate($id) {
        $model = $this->loadModel($id);

        // Uncomment the following line if AJAX validation is needed
        // $this->performAjaxValidation($model);

        if (isset($_POST['Article'])) {
            $model->attributes = $_POST['Article'];
            if ($model->save())
                $this->redirect(array('view', 'id' => $model->id));
        }

        $this->render('update', array(
            'model' => $model,
        ));
    }

    /**
     * Deletes a particular model.
     * If deletion is successful, the browser will be redirected to the 'admin' page.
     * @param integer $id the ID of the model to be deleted
     */
    public function actionDelete($id) {
        if (Yii::app()->request->isPostRequest) {
            // we only allow deletion via POST request
            $this->loadModel($id)->delete();

            // if AJAX request (triggered by deletion via admin grid view), we should not redirect the browser
            if (!isset($_GET['ajax']))
                $this->redirect(isset($_POST['returnUrl']) ? $_POST['returnUrl'] : array('admin'));
        }
        else
            throw new CHttpException(400, 'Invalid request. Please do not repeat this request again.');
    }

    /**
     * Lists all models.
     */
    public function actionIndex() {
        $criteria = new CDbCriteria(array(
                    'condition' => 'status=' . Article::STATUS_PUBLISHED,
                    'order' => 'update_time DESC',
                    'with' => 'commentCount',
                ));
        if (isset($_GET['tag']))
            $criteria->addSearchCondition('tags', $_GET['tag']);

        $dataProvider = new CActiveDataProvider('Article', array(
                    'pagination' => array(
                        'pageSize' => Yii::app()->params['articlesPerPage'],
                    ),
                    'criteria' => $criteria,
                ));

        $this->render('index', array(
            'dataProvider' => $dataProvider,
        ));
    }

    public function actionCategory($id) {
        $criteria = new CDbCriteria(array(
                    'condition' => 'status=' . Article::STATUS_PUBLISHED . ' AND category_id=' . $id,
                    'order' => 'update_time DESC',
                    'with' => 'commentCount',
                ));
        $dataProvider = new CActiveDataProvider('Article', array(
                    'pagination' => array(
                        'pageSize' => Yii::app()->params['articlesPerPage'],
                    ),
                    'criteria' => $criteria,
                ));

        $this->render('index', array(
            'dataProvider' => $dataProvider,
        ));
    }

    /**
     * Manages all models.
     */
    public function actionAdmin() {
        $model = new Article('search');
        $model->unsetAttributes();  // clear any default values
        if (isset($_GET['Article']))
            $model->attributes = $_GET['Article'];

        $this->render('admin', array(
            'model' => $model,
        ));
    }

    /**
     * Returns the data model based on the primary key given in the GET variable.
     * If the data model is not found, an HTTP exception will be raised.
     * @param integer the ID of the model to be loaded
     */
//    public function loadModel($id) {
//        $model = Article::model()->findByPk($id);
//        if ($model === null)
//            throw new CHttpException(404, 'The requested page does not exist.');
//        return $model;
//    }

    /**
     * Performs the AJAX validation.
     * @param CModel the model to be validated
     */
    protected function performAjaxValidation($model) {
        if (isset($_POST['ajax']) && $_POST['ajax'] === 'article-form') {
            echo CActiveForm::validate($model);
            Yii::app()->end();
        }
    }

    /**
     * Suggests tags based on the current user input.
     * This is called via AJAX when the user is entering the tags input.
     */
    public function actionSuggestTags() {
        if (isset($_GET['q']) && ($keyword = trim($_GET['q'])) !== '') {
            $tags = Tag::model()->suggestTags($keyword);
            if ($tags !== array())
                echo implode("\n", $tags);
        }
    }

    /**
     * Returns the data model based on the primary key given in the GET variable.
     * If the data model is not found, an HTTP exception will be raised.
     */
    public function loadModel() {
        if ($this->_model === null) {
            if (isset($_GET['id'])) {
                if (Yii::app()->user->isGuest)
                    $condition = 'status=' . Article::STATUS_PUBLISHED . ' OR status=' . Article::STATUS_ARCHIVED;
                else
                    $condition = '';
                $this->_model = Article::model()->findByPk($_GET['id'], $condition);
            }
            if ($this->_model === null)
                throw new CHttpException(404, 'The requested page does not exist.');
        }
        return $this->_model;
    }

    /**
     * Creates a new comment.
     * This method attempts to create a new comment based on the user input.
     * If the comment is successfully created, the browser will be redirected
     * to show the created comment.
     * @param Post the post that the new comment belongs to
     * @return Comment the comment instance
     */
    protected function newComment($article) {
        $comment = new Comment;
        if (isset($_POST['ajax']) && $_POST['ajax'] === 'comment-form') {
            echo CActiveForm::validate($comment);
            Yii::app()->end();
        }
        if (isset($_POST['Comment'])) {
            $comment->attributes = $_POST['Comment'];
            if ($post->addComment($comment)) {
                if ($comment->status == Comment::STATUS_PENDING)
                    Yii::app()->user->setFlash('commentSubmitted', 'Thank you for your comment. Your comment will be posted once it is approved.');
                $this->refresh();
            }
        }
        return $comment;
    }

}
